Driveability for the experienced., Diag codes 35, 42. Options

[ScottDavid]

Hello Toyota enthusiasts.

Well Long story short Im obviously new here. Not to working on cars....New to Toyota though.

I swapped a 93 jap spec 3sgte into a 96 gt celica. Runs great but after a la hot of test driving and quality checking I had only two diag codes.

35 - Turbo Charging pressure sensor signal
42 - Vehicle speed sensor signal.

As far as the T/C pres sensor. I have a steady 4.98v reference while idling, cruising and boosting.
I have a varying signal voltage with is .1682v @ light throttle which will increase with load to WOT @ 4.97v
The ground circuit is always grounded.

Now, as far as driveability, I noticed that while the engine is normal operating temp its boosting fin, 7-10 psi.
Great performance!

After the engine is fully warm....I was WOT and felt a slight loss of acceleration along with a slight drop in boost. And after the check engine light. max boost 6-7 psi.

Now, The wiring is all cherry, because I did it. My continuity checks are fine from sensor to ecm.

Ok, so the stock 3sgte jap spec vehicle has a turbo gauge built into the cluster....I dont have the stock cluster, I have an aftermarket gauge.

As far as code 42.....Have not tested yet.

Has anyone had this issue or has info on my driveability issue? I will appreciate it.

-Scott

[lagos]

Lagos, I understand that part. But boost gauge never rose above 10psi. Im thinking into it too much! This is just a very well built engine by myself....

Actually ... your right. Code 34 is fuel cut, not code 35.
Code 35 happens when you forget to plug the map sensor into the harness plug. So check that. If its fine, then inspect the wiring.

As for code 42, you need to check your swap wiring. It looks like your not sending the spd signal back to the ecu from the gauge cluster. If you do a search, I wrote up a detailed HowTo in someones thread on the speedo wiring a while back.

[DEATH]

Lagos, I understand that part. But boost gauge never rose above 10psi. Im thinking into it too much! This is just a very well built engine by myself....

Actually ... your right. Code 34 is fuel cut, not code 35.
Code 35 happens when you forget to plug the map sensor into the harness plug. So check that. If its fine, then inspect the wiring.

As for code 42, you need to check your swap wiring. It looks like your not sending the spd signal back to the ecu from the gauge cluster. If you do a search, I wrote up a detailed HowTo in someones thread on the speedo wiring a while back.

My thread [I also have a code 42 showing]. Here you go [Little over halfway down]:
http://www.6gc.net/forums/index.php?showto...57042&st=40
Courtesy of Lagos . Wiring diagrams on page two for your convenience.